/Engine/Source/Runtime/PakFile/Public/IPlatformFilePak.h
Helper function to split a PakDirectoryIndex-Formatted PathName into its PakDirectoryIndex-Formatted parent directory and the CleanFileName
static bool SplitPathInline ( [FString](API\Runtime\Core\Containers\FString) & InOutPath, [FString](API\Runtime\Core\Containers\FString) & OutFilename )